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Python Pandas merge only certain columns
...nly merge some columns? I have a DataFrame df1 with columns x, y, z, and df2 with columns x, a ,b, c, d, e, f, etc.
5 Answe...
Split list into multiple lists with fixed number of elements
...
214
I think you're looking for grouped. It returns an iterator, but you can convert the result to ...
Looping over a list in Python
...
200
Try this,
x in mylist is better and more readable than x in mylist[:] and your len(x) should ...
`levels
...on, @Marek posted the following solution:
https://stackoverflow.com/a/10432263/636656
4 Answers
...
What do (lambda) function closures capture?
...e a new scope each time you create the lambda:
>>> adders = [0,1,2,3]
>>> for i in [0,1,2,3]:
... adders[i] = (lambda b: lambda a: b + a)(i)
...
>>> adders[1](3)
4
>>> adders[2](3)
5
The scope here is created using a new function (a lambda, for brevity...
How to sort Counter by value? - python
...
261
Use the Counter.most_common() method, it'll sort the items for you:
>>> from collect...
Why is parenthesis in print voluntary in Python 2.7?
In Python 2.7 both the following will do the same
4 Answers
4
...
How to fix error with xml2-config not found when installing PHP from sources?
...
All you need to do instal install package libxml2-dev for example:
sudo apt-get install libxml2-dev
On CentOS/RHEL:
sudo yum install libxml2-devel
share
|
improve thi...
How to find the length of a string in R
...
424
See ?nchar. For example:
> nchar("foo")
[1] 3
> set.seed(10)
> strn <- paste(sampl...
Appending to an empty DataFrame in Pandas?
... pd.DataFrame({"A": range(3)})
>>> df.append(data)
A
0 0
1 1
2 2
But the append doesn't happen in-place, so you'll have to store the output if you want it:
>>> df
Empty DataFrame
Columns: []
Index: []
>>> df = df.append(data)
>>> df
A
0 0
1 1
2 2
...